Which biogeochemical cycle does not include a significant free gaseous reservoir in the Earth's atmosphere?
Answer and explanation
Correct answer: D. Phosphorus cycle
- Step 1: Survey major biogeochemical nutrient cycles.
- Step 2: Phosphorus resides primarily in sedimentary rock, soil, and aquatic sediments, lacking any stable atmospheric gaseous phase under normal environmental conditions.
Answer
Phosphorus cycle.
Why not the others: The carbon cycle features atmospheric CO₂; nitrogen gas (N₂) constitutes 78% of the atmosphere; water vapor is a primary atmospheric constituent.
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